Hypodermic syringe and needle therefor



patented May El, 1927.

W t -s:

OFFIC HYronEEMIc sYErNeE Ann NEEDLE THEEEEoR.

- Application filed. April 19, 1926, Serial 110,162,991, and in Great Britain April 30, .1925. V

This invention comprises improvements in and connected With hypodermic syringes and needles therefor; Heretofore, when a hypodermic needle has been fixed in the'nipple or nozzle constituting the mount for the needle on the syringe, the said needle has been insertedinto a small bore formed in the mount and has been fixed therein, generally by soldering. One object of these improvements is to provide a more effective and economical method for fixing the needlesin the mounts. 1

Needle head devices machined to have various external formations, have been attached to hypodermic needles by burnishing, swaging and like operation, and the mouth of the bore in such heads has been countersunk. The needle head of these imbprovements, however, is distinguished from these known heads by the fact. that it is forced through a. die for attaching it to the needle and for adapting it forfixing in the needle mounting. v According to this invention, theneedle inserted into the bore of a small cylindrical stamping or. piece of tubing adapted'to form the head and the latter, with the inserted needle, is forced into and through a die which reduces the diameter of the cylindrical piece,

Y and extends its length. The needle mount is formed with atapered socket or hole, a slight taper being sufficient for the cylindrical head to fit into and the'needle isfixed in the mount by forcing the cylindrical head tightly into the tapered hole or socket;

; Solder may be used for making the joint more secure but in the ordinary way the vsecurity of the mounting attained by the tight engagement of the tapered partsis all sufficient for the purpose.

In order to enable the invention to be readily understood, reference is made to the accompanying drawing illustrating examples of suitable constructions on an enlarged scale in which drawing:-' e

Figure 1 is a central longitudinal section of a hypodermic needle having its blunt end, inserted into a tubular head and showing in V elevation the plunger by forced through a die.

Figure 2 is a section of the die through which the head is which the head is forced, I y

Figure 3 is a section corresponding to Fig ure 1 showing the needle with the tubular head fixed thereto after having been forced through the die.

Referring to vFigure 1,1'0 is a tubular hypodermic syringe needle having its blunt end inserted into a cylindrical tubularblank I or head b and c is a plunger for forcing the said head through a die d shown in Figure 2." This die is formed with a tapered hole or cavity 6 extending therethrough. The

head 6 having the blunt end of the. needle a" inserted into it as shown in Figurel, is introducedv into the mouth of' the hole or cavity of the die (land by application of pressure by the plunger 0, the head is elon gated and compressed around the needle av so as vto bevery tightly engaged withthe latter. Indeed, a fluid-tight 'joint is produced between the needle and the head by Moreover, owing to the shape of the pointed end ot the plunger 0 a conical recess is imparted to the outer end of the head 6 as blank, and forcing the blank with the needle therein. through .a redi1cing ;die, thereby and simultaneously elongating the blank effect ng a permanent connection, of the needle and blank.

2. Inthe production of hypodermicnee-f dles, the method of forming heads thereon which comprises, surrounding the blunt end of the needle with a tubular cylindrical metal blank, and forcing the assembled needle and blank through a reducing die, whereby the blank is elongatedwhile being pressed permanently onto the needle.

production of hypodermic '75 will be readily understood from Figure 3.- I i '3. In the production of hypodermic syringe needles, the method of thereon, which comprises arranging -a tubuforming a permanent connection between the needle and blank,

SAlilUEL'JAMES EVERE forming heads loo , lar cylindrical metal blank on the blunt end 5 f of the needle, and forcing the assembled nee:

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